Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income
Income (loss) from continuing operations	$ 14,343	$ 9,756	$ (104,638)	$ 7,435	$ 15,310	$ 12,263	$ 9,954	$ 8,350	$ (73,104)	$ 45,877	$ 55,194
Loss from discontinued operations	(3,647)	(893)	(5,067)	(642)	(582)	(135)	(529)	(433)	(10,249)	(1,679)	(1,590)
Net income (loss)	$ 10,696	$ 8,863	$ (109,705)	$ 6,793	$ 14,728	$ 12,128	$ 9,425	$ 7,917	$ (83,353)	$ 44,198	$ 53,604
Basic earnings (loss) per common share
Weighted-average common shares outstanding used in earnings per share computations									62,887	63,173	63,616
Continuing operations (in dollars per share)	$ 0.23	$ 0.15	$ (1.66)	$ 0.12	$ 0.24	$ 0.20	$ 0.16	$ 0.13	$ (1.16)	$ 0.73	$ 0.87
Discontinued operations (in dollars per share)	$ (0.06)	$ (0.01)	$ (0.08)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.17)	$ (0.03)	$ (0.03)
Basic earnings (loss) per common share (in dollars per share)	$ 0.17	$ 0.14	$ (1.74)	$ 0.11	$ 0.23	$ 0.19	$ 0.15	$ 0.12	$ (1.33)	$ 0.70	$ 0.84
Diluted earnings (loss) per common share
Shares used in diluted earnings per share computations									62,887	63,552	64,139
Continuing operations (in dollars per share)	$ 0.23	$ 0.15	$ (1.66)	$ 0.12	$ 0.24	$ 0.19	$ 0.16	$ 0.13	$ (1.16)	$ 0.72	$ 0.86
Discontinued operations (in dollars per share)	$ (0.06)	$ (0.01)	$ (0.08)	$ (0.01)	$ (0.01)	$ 0.00	$ (0.01)	$ (0.01)	$ (0.17)	$ (0.02)	$ (0.02)
Diluted earnings (loss) per common share (in dollars per share)	$ 0.17	$ 0.14	$ (1.74)	$ 0.11	$ 0.23	$ 0.19	$ 0.15	$ 0.12	$ (1.33)	$ 0.70	$ 0.84
Computation of Shares Used in Earnings Per Share Computations
Weighted-average common shares outstanding (in shares)									62,887	63,173	63,616
Weighted-average common equivalent shares - dilutive effect of stock options and awards									0	379	523
Shares used in diluted earnings per share computations									62,887	63,552	64,139

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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